PCA9548A
8-channel I
2
C-bus switch with reset
Rev. 5 — 31 March 2014
Product data sheet
1. General description
The PCA9548A is an octal bidirectional translating switch controlled via the I
2
C-bus. The
SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any individual
SCx/SDx channel or combination of channels can be selected, determined by the
contents of the programmable control register.
An active LOW reset input allows the PCA9548A to recover from a situation where one of
the downstream I
2
C-buses is stuck in a LOW state. Pulling the RESET pin LOW resets
the I
2
C-bus state machine and causes all the channels to be deselected as does the
internal Power-on reset function.
The pass gates of the switches are constructed such that the V
DD
pin can be used to limit
the maximum high voltage which will be passed by the PCA9548A. This allows the use of
different bus voltages on each pair, so that 1.8 V or 2.5 V or 3.3 V parts can communicate
with 5 V parts without any additional protection. External pull-up resistors pull the bus up
to the desired voltage level for each channel. All I/O pins are 6 V tolerant.
2. Features and benefits
1-of-8 bidirectional translating switches
I
2
C-bus interface logic; compatible with SMBus standards
Active LOW reset input
Three address pins allowing up to eight devices on the I
2
C-bus
Channel selection via I
2
C-bus, in any combination
Power-up with all switch channels deselected
Low R
on
switches
Allows voltage level translation between 1.8 V, 2.5 V, 3.3 V and 5 V buses
No glitch on power-up
Supports hot insertion
Low standby current
Operating power supply voltage range of 2.3 V to 5.5 V
6 V tolerant inputs
0 Hz to 400 kHz clock frequency
ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per
JESD22-C101
Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
Three packages offered: SO24, TSSOP24, and HVQFN24
NXP Semiconductors
PCA9548A
8-channel I
2
C-bus switch with reset
3. Ordering information
Table 1.
Ordering information
Topside
marking
548A
PCA9548AD
PCA9548A
Package
Name
HVQFN24
SO24
TSSOP24
Description
plastic thermal enhanced very thin quad flat package;
no leads; 24 terminals; body 4
4
0.85 mm
plastic small outline package; 24 leads; body width 7.5 mm
plastic thin shrink small outline package; 24 leads;
body width 4.4 mm
Version
SOT616-1
SOT137-1
SOT355-1
Type number
PCA9548ABS
PCA9548AD
PCA9548APW
3.1 Ordering options
Table 2.
Ordering options
Orderable
part number
PCA9548ABS,118
PCA9548ABSHP
PCA9548AD
PCA9548AD,112
PCA9548AD,118
PCA9548APW
PCA9548APW,112
PCA9548APW,118
Package
Packing method
Minimum
order
quantity
6000
6000
1200
1000
1575
2500
Temperature
Type number
PCA9548ABS
HVQFN24
HVQFN24
SO24
SO24
TSSOP24
TSSOP24
Reel 13” Q1/T1
*Standard mark SMD
Reel 13” Q2/T3
*Standard mark SMD
Standard marking
IC’s tube - DSC bulk pack
Reel 13” Q1/T1
*Standard mark SMD
Standard marking
IC’s tube - DSC bulk pack
Reel 13” Q1/T1
*Standard mark SMD
T
amb
=
40 C
to +85
C
T
amb
=
40 C
to +85
C
T
amb
=
40 C
to +85
C
T
amb
=
40 C
to +85
C
T
amb
=
40 C
to +85
C
T
amb
=
40 C
to +85
C
PCA9548A
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 5 — 31 March 2014
2 of 30
NXP Semiconductors
PCA9548A
8-channel I
2
C-bus switch with reset
5. Pinning information
5.1 Pinning
A0
A1
RESET
SD0
SC0
SD1
SC1
SD2
SC2
1
2
3
4
5
6
7
8
9
24 V
DD
23 SDA
22 SCL
21 A2
20 SC7
19 SD7
18 SC6
17 SD6
16 SC5
15 SD5
14 SC4
13 SD4
002aab199
A0
A1
RESET
SD0
SC0
SD1
SC1
SD2
SC2
1
2
3
4
5
6
7
8
9
24 V
DD
23 SDA
22 SCL
21 A2
20 SC7
19 SD7
18 SC6
17 SD6
16 SC5
15 SD5
14 SC4
13 SD4
002aab200
PCA9548AD
PCA9548APW
SD3 10
SC3 11
V
SS
12
SD3 10
SC3 11
V
SS
12
Fig 2.
Pin configuration for SO24
24 RESET
Fig 3.
Pin configuration for TSSOP24
20 SDA
23 A1
SD0
SC0
SD1
SC1
SD2
SC2
1
2
3
4
5
6
SD4 10
SC4 11
SD5 12
7
8
9
22 A0
terminal 1
index area
19 SCL
18 A2
17 SC7
16 SD7
15 SC6
14 SD6
13 SC5
002aab201
PCA9548ABS
SD3
Transparent top view
Fig 4.
Pin configuration for HVQFN24 (transparent top view)
PCA9548A
All information provided in this document is subject to legal disclaimers.
SC3
V
SS
21 V
DD
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 5 — 31 March 2014
4 of 30
NXP Semiconductors
PCA9548A
8-channel I
2
C-bus switch with reset
5.2 Pin description
Table 3.
Symbol
A0
A1
RESET
SD0
SC0
SD1
SC1
SD2
SC2
SD3
SC3
V
SS
SD4
SC4
SD5
SC5
SD6
SC6
SD7
SC7
A2
SCL
SDA
V
DD
[1]
Pin description
Pin
SO24, TSSOP24
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
HVQFN24
22
23
24
1
2
3
4
5
6
7
8
9
[1]
10
11
12
13
14
15
16
17
18
19
20
21
address input 0
address input 1
active LOW reset input
serial data 0
serial clock 0
serial data 1
serial clock 1
serial data 2
serial clock 2
serial data 3
serial clock 3
supply ground
serial data 4
serial clock 4
serial data 5
serial clock 5
serial data 6
serial clock 6
serial data 7
serial clock 7
address input 2
serial clock line
serial data line
supply voltage
Description
HVQFN24 package die supply ground is connected to both the V
SS
pin and the exposed center pad. The
V
SS
pin must be connected to supply ground for proper device operation. For enhanced thermal, electrical,
and board-level performance, the exposed pad needs to be soldered to the board using a corresponding
thermal pad on the board, and for proper heat conduction through the board thermal vias need to be
incorporated in the PCB in the thermal pad region.
PCA9548A
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 5 — 31 March 2014
5 of 30
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